Let x be a randomly selected value from a normal distribution with mean 39 and standard deviation 19. If P(x≤ k) is approximately 0.8643, what is the value of k? Please help!

Period is the time it takes for one “cycle” to complete. in the parent sine function, period is 2*pi since sin(0) = 0, sin(pi/2) = 1, sin(pi) = 0, sin(3pi/2) = -1, and sin(2pi) = 0. at that point, the sequence repeats itself. i’m not sure if your graph is similar to the sine function since you didn’t provide a picture, but you can find the period by looking at a graph.

It is e) i am not sure if you have any questions or need any

Is it multiple choice